| cycloaspeptides f and g, cyclic pentapeptides from a cordyceps-colonizing isolate of isaria farinosa. | cycloaspeptides f (1) and g (2), two new cyclic pentapeptides, and the known cycloaspeptides a (3), c (4), and bisdethiodi(methylthio)hyalodendrin (5) have been isolated from the crude extract of the fungus isaria farinosa that colonizes cordyceps sinensis. the structures of 1 and 2 were elucidated primarily by nmr and ms methods. the absolute configuration of 1 was assigned using marfey's method on its acid hydrolysate. compounds 1 and 2 showed cytotoxic effects against hela and mcf7 cell lines ... | 2009 | 19572613 |